Rotary pump



G. W. LEIMAN.

ROTARY PUMP.

APPLICATION FILED DEC.23, i919.

Patented Apr. 25, 1922;

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GEORGE W. LEIMAN, OF NEWARK, NEW JERSEY.

ROTARY PUMP.

Specification of Letters Patent. 1 Patented Apr. 25, 1922.

Application filed December 23, 1919. Serial No. 346.904.

Tomllwhomitmay com-em:

Be it known that I, GEORGE W. 'L IMAN, a citizen of the United States, and resident of Newark, in the county of Essex and State of New Jersey, have invented a new and useful Improvement in Rotary Pumps, of which the following is a specification.

This invention relates to a rotary pump and more particularly to a pump in which the air is drawn into or expelled from the pump by vibrating the wings, the object being to provide a simple, effective and more durable means for mounting the vibrating wings. Q

Another object is to provide a rotary pump having inlet and outlet ports arranged in the cylinder heads out of contact with the outer or peripheral frictional surface of the wings.

Another object is to provide simple, effective means for maintaining a supply of oil in the shaft bearings.

A still further object is to provide certain improvements in the form, co'nstructionand arrangement of the parts, whereby the above named and other objects may be effectively attained. v

A practical embodiment of my invention is represented in the accompanying drawings in which, A

Fig. 1 represents an end elevation, partly in section of my'improved pump.

Fig. 2 representsa vertical section taken in the plane of the line H of Fig.1, looking in the direction of the arrow.

Fig. 3 represents a detail horizontal section taken through one of the wing mount ings and the adjacent parts.

Fig. 4 represents a detail horizontal sec-- tion taken through the inlet pipe and the adjacent parts, and I Fig. 5 represents a detail vertical section taken through the outlet pipe and the adja-' cent parts.

The cylinder of the pump is denoted by 1, and its heads by 2 and 3. A shaft 4 extends eccentrically through thecylinder 1 passing through the heads 2 and'3, and through suitable bearings in oil receptacles 5 and 6, formed integral with the outer faces of the cylinder heads 2 and 3.

The cylinder is supported on brackets 7 and 8 secured to lugs 9 and 10, depending from the cylinder, by bolts 11, through which brackets the pump may be bolted to the floor or other suitable support. The cylinder 1 is provided in its peripheral wall heads 2 and 3,and is connected with the interior of the cylinder by means of bypasses 18, 19 in the heads 12-and '3'.

A piston 20 of cylindrical form, is fixed on the shaft 4 andis provided at suitable intervals with open sockets 21, in the present instance, four in number located a quadrantsdistance apart, the said sockets being arranged to 7 receive the knuckles 22 of vibrating wings 23. The wings are held in the sockets by means of pins 24 secured in bracket-s 25. carried by the piston 20. The pins 24 are held against movement by keys 26 fitted tightly into kerfs 27 in the ends of the pins and extending into slots 28 in the brackets 25. The joints between the sockets and wings are made substantially tight by packing plates 29 fitted to slide in ways 30,

in the piston and yieldingly held in engagement with theknuckles' by springs 31'housed in recesses-32 in thepiston. .The wings are quite similar toone another and consist of a curved plate, the curve 34 on the inner face of the plate corresponding to the curve of the periphery of the piston 20, and the curve 35 on the outer face of the plate corresponding throughout the greater portion of the length of the plate to the curve of the interior of the cylinder, but sharpened or made more abrupt near the opposite ends of the plate, so that when the central portion 7 I I of the plate is in contact with the interior of the cylinder 1-, the knuckle and forward ends of the plate will recede from the inte-' rior of the cylinder, as clearlyindicated in;

. pring pressed plungers 36 are mounted in the piston 20 in position to engage the inner faces 34 of the plates to exert ressure on the plates and force them away f f'om the piston into contact with the interior of the cylinder 1, and which also serve to cushion the inner thrust of the plates under the action of the interior of-the cylinder as the piston with the wings thereon, is rotated.

The free end 37 of each wing is made in a plane which is slightly oblique to the radius of the piston 20 and is intended to rest when the wing is closed on the piston in close proximity to the knuckle of the adjacent Wing. By this arrangement of pivoting each wing is given the greatest possible peripheral surface, which affords more volume and greater compression when in action.

To prevent the oil from being sucked from the oil receptacles 5, 6, through the shaft bearing to the interior of the cylinder or the escape of air from within, I provide each of the inner walls of the heads 2 and 3 around the shaft with a beveled recess 38 for the reception of a collar 39 having its face adjacent the wall tapered and fitted to seat in the recess 38. The collar 39 is provided with a recess 40 arranged to receive packing 41 yieldingly held in position by a spring 42 surrounding the shaft and interposed between a hub 43 of the piston 20 and a follower 44. The collar 39 and follower 44 are held in fixed relation with the piston by means of a pin 45 fast in the hub 43 and projecting outwardly into slots 46, 47 in the collar and follower.

In operation, as the piston 20 is rotated byv means of the shaft 4 in a clockwise direction, the air received through the inlet pipe 13 will pass through the inlet port 12 to the bypasses 14, 15 in the heads 2 and 3, thence into the cylinder between two consecutive wings, when it will be carried forward to'the bypasses 18, 19 in the. heads 2 and 3, and forced out through the outlet port 16 and pipe 17 the operation being repeated with each succeeding wing. As the air between two wings is carried from the inlet to the outlet ports, the wings will be forced in their paths around the cylinder toward the piston and as they advance toward the outlet, the air between them will become compressed, which com pression carries the free end of the wings to bear tightly against the inner walls of the cylinder. The arrangement of the inlet and outlet by-passes in the heads 2 and 3 eliminates the wear and tear of the wings on the openings since there is no lateral pressure of the wings on the by-passes. It will also be observed that by this arrangement of ports for the intake and discharge of the air, a

very smooth and easy running pump will be obtained with the least amount of friction and requiring only a minimum amount of power to operate the pump.

It is obvious that various changes may be resorted to in the form, construction and arrangement of the several parts without departing from the spirit and scope. of my inpiston, and inlet and outlet openings con nected to the cylinder through the heads.

2. The comblnation with a cylinder having.

heads, and a shaft extending eccentrically through said cylinder and heads, of a piston on said shaft having open sockets in its periphery, vibrating wings provided with knuckles arranged to oscillate in said sockets, brackets on the piston overhanging the sockets and knuckles, pins fixed in said brackets and passing through said knuckles to support the wings in position to swing toward and away from the piston, and inlet and outlet openings connected to the cyl inder through the heads.

3. The combination with a cylinder having heads, and a shaft extending eccentrically through said cylinder and heads, of a piston on said shaft having open sockets in its periphery, vibrating wings provided with knuckles arranged to oscillate in said sockets,

brackets on the piston overhanging the sock ets and knuckles, pins fixed in said brackets and passin through said knuckles'to support the wings in position to swing toward and away from the piston, means for securing the pins in the brackets, and inlet and outlet openings connected to the cylinder throu h the heads.

4. he combination with a cylinder having heads, and a shaft extending eccentrically through said cylinder and heads, of a piston on said shaft having open sockets, vibrating wings in said sockets, brackets on the piston, pins in said brackets engaging said wings to support the wings in position to swing toward and away from the piston,.means for securing the pins in the brackets, said means comprising kerfs in the pins, recesses in the brackets and keys fitted in said kerf and recesses, and inlet and outlet openings connected to the cylinderthrough the heads.

In testimony, that I claim the foregoing as my invention, ll have signed my name, this ninth day of December 1919.

GEORGE W. LETMAN. 

